题目内容
Xiao Li was about to cheat in the exam ________ the teacher came up, smiling to him.
| A.as | B.when | C.while | D.until |
B
考查固定句型。Be about to do …when…正要做某事,这时……,所以选B。
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| A.as | B.when | C.while | D.until |